title: Apolocystis cognetti sp. nov. (Apicomplexa: Monocystinae) a new aseptate gregarine species from the earthworm Amynthas hawayanus (Annelida: Oligochaeta) from West Bengal, India.
abstract: During the course of surveys of endoparasitic aseptate gregarines in Darjeeling district of West Bengal, India, seminal vesicles of Amynthas hawayanus (Rosa 1891) found to be infested with a new species of the genus Apolocystis (Cognetti de Martiis 1923). Trophozoites are spherical or rounded and without any polar differentiation. Diameter of the trophozoite ranges from 65.4 to 126.7 (91.8 ± 17.5) μm. Nucleus diameter measures 12.2-20.4 (14.4 ± 2.2) μm. Gametocyst is round and measures 73.6-110.4 (93.3 ± 14.0) μm and contains two unequal gametocytes. Oocyst measures 7.7-10.7 (9.5 ± 0.9) μm × 3.8-5.3 (4.6 ± 0.4) μm.
authors.affiliation: Department of Zoology, Panchakot Mahavidyalaya, Sarbari More, P.O. Neturia, District Purulia, 723121 West Bengal India.
authors.forename: Biplab
authors.initials: B
authors.lastname: Bhowmik
authors.forename: Probir K
authors.initials: PK
authors.lastname: Bandyopadhyay
authors.forename: Amlan Kumar
authors.initials: AK
authors.lastname: Mitra
keywords: Amynthas hawayanus; Apolocystis cognetti sp. nov.; Aseptate; Earthworm; Gregarine parasite; Seminal vesicle